package main

import "fmt"

func main() {

	myGreeting := map[string]string{
		"Tim":   "Good morning!",
		"Jenny": "Bonjour!",
	}

	myGreeting["Harleen"] = "Howdy"

	fmt.Println(len(myGreeting))

	map2 := make(map[string]float32, 100)
	fmt.Println("长度",len(map2))
}
